Added git-hash-metrics builder and recipe

scripts/slave/recipes/infra/git_hash_metric.py

+# Copyright 2016 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+from recipe_engine.recipe_api import Property
+
+DEPS = [
+    'recipe_engine/properties',
+    'recipe_engine/python',
+]
+
+
+def RunSteps(api):
+  git_revision = api.properties['git_revision']
+  repository = api.properties['repository']
+
+  api.python(
+    'send hash to ts_mon',
+    '/opt/infra-python/run.py',
+    ['infra.tools.send_ts_mon_values',
+     '--verbose',
+     '--ts-mon-target-type=task',
+     '--ts-mon-task-service-name=git_hash_metric',
+     ('--string=\'{"name":"repository/hash", '
+      '"value": "%s", "repository": "%s"}\'' % (git_revision, repository)),
+   ]
+  )
+
+
+def GenTests(api):
+  yield (api.test('infra') +
+         api.properties.git_scheduled(
+           git_revision='deadbeefdeadbeefdeadbeefdeadbeefdeadbeef',
+           repository='https://chromium.googlesource.com/infra/infra'
+         )
+  )